<div class="container">
  <img src="https://banana.by/uploads/thumbs/267/266083.jpg" alt="">
</div>

.container {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation-name: pulse;
  transform-origin: center center;
  animation-iteration-count: infinite;
  animation-duration: 1s;
}
img {
  width: 150px;
  height: 150px
}

@keyframes pulse {
  0% {
    -webkit-transform: scale(1);
    -ms-transform: scale(1);
    transform: scale(1);
  }
  50% {
      -webkit-transform: scale(1.1);
      -ms-transform: scale(1.1);
      transform: scale(1.1);
  }
  100% {
      -webkit-transform: scale(1);
      -ms-transform: scale(1);
      transform: scale(1);
  }
}